﻿// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Observable.cs" company="OxyPlot">
//   The MIT License (MIT)
//
//   Copyright (c) 2012 Oystein Bjorke
//
//   Permission is hereby granted, free of charge, to any person obtaining a
//   copy of this software and associated documentation files (the
//   "Software"), to deal in the Software without restriction, including
//   without limitation the rights to use, copy, modify, merge, publish,
//   distribute, sublicense, and/or sell copies of the Software, and to
//   permit persons to whom the Software is furnished to do so, subject to
//   the following conditions:
//
//   The above copyright notice and this permission notice shall be included
//   in all copies or substantial portions of the Software.
//
//   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
//   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
//   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
//   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
//   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
//   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
// --------------------------------------------------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;

namespace WorldStatisticsDemo
{
    public class Observable : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void RaisePropertyChanged(string property)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(property));
            }
        }

        protected void RaisePropertyChanged(Expression<Func<object>> expression)
        {
            var lambda = expression as LambdaExpression;
            MemberExpression memberExpression;
            if (lambda.Body is UnaryExpression)
            {
                var unaryExpression = lambda.Body as UnaryExpression;
                memberExpression = unaryExpression.Operand as MemberExpression;
            }
            else
            {
                memberExpression = lambda.Body as MemberExpression;
            }
            if (memberExpression != null)
            {
                var propertyInfo = memberExpression.Member as PropertyInfo;
                if (propertyInfo != null)
                    RaisePropertyChanged(propertyInfo.Name);
            }
        }
    }
}